[APP-690] better handling of post languages language filtering (#893)

* add SelectLangBtn

* memoized objects that are created to reduce re-creation on re-render

* add langs when uploading post

* only send the top 3 languages otherwise backend will throw error

* mv ContentLanguagesSettings to folder

* add post languages settings modal and state

* fix typos

* modify feed manip to also check langs label on post

* Fix tests

* Remove log

* Update feed-manip.ts

* Fix syntax errors

* UI tuneups

* Show the currently selected languages in the composer

* fix linting

* Use a bcp-47 matching function

* Fix a duplicate language issue

* Fix web

* Dont include lang in prompt

* Make select language btn an observer

* Keep device languages on top of language selection UIs

* Fix android build settings

* Enforce a max of 3 languages in posts

* Fix tests

* Fix types

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

package.json

@@ -66,6 +66,7 @@
     "@zxing/text-encoding": "^0.9.0",
     "await-lock": "^2.2.2",
     "base64-js": "^1.5.1",
+    "bcp-47-match": "^2.0.3",
     "email-validator": "^2.0.4",
     "eslint-plugin-react-native-a11y": "^3.3.0",
     "expo": "~48.0.18",
@@ -207,7 +208,7 @@
       "node"
     ],
     "transformIgnorePatterns": [
-      "node_modules/(?!((jest-)?react-native|@react-native(-community)?)|expo(nent)?|@expo(nent)?/.*|@expo-google-fonts/.*|react-navigation|@react-navigation/.*|@unimodules/.*|unimodules|sentry-expo|native-base|normalize-url|react-native-svg|@sentry/.*|sentry-expo)"
+      "node_modules/(?!((jest-)?react-native|@react-native(-community)?)|expo(nent)?|@expo(nent)?/.*|@expo-google-fonts/.*|react-navigation|@react-navigation/.*|@unimodules/.*|unimodules|sentry-expo|native-base|normalize-url|react-native-svg|@sentry/.*|sentry-expo|bcp-47-match)"
     ],
     "modulePathIgnorePatterns": [
       "__tests__/.*/__mocks__",